Consecutively numbered purchase orders and numbered lines help with record keeping. Keep a bound copy for a permanent record. • Consecutively numbered purchase orders and numbered lines help with record keeping. • Keep a bound copy for a permanent record. Consecutively numbered purchase orders and numbered lines help with record keeping. Keep a copy for a permanent record. 12 Lines. Form Type Details: Invoice/Receipt; Dated: No; Forms Per Page: 1; Form Size: 5.56 x 8.44.